Mongodb 3.0 部署 Shard

> 配置分片集群

**假设我们要配置如下集群**
|      test1      |      test2      |      test3      |      test4      |
|-----------------|-----------------|-----------------|-----------------|
|mongod rs0 27018 |mongod rs0 27018 |arbit rs0 27019  |                 |
|                 |arbit rs1 27019  |mongod rs1 27018 |mongod rs1 27018 |
|configdb 27020   |configdb 27020   |configdb 27020   |                 |
|                 |                 |                 |mongos 27017     |

#集群部署
##安装由mongod和arbit 组成的rs0 和 rs1 集群。
* 启动test1 的 mongod
```
[leo@test1 bin]$ cat mongod.cfg
sharding:
    clusterRole: shardsvr
replication:
    replSetName: rs0
systemLog:
    destination: file
    path: /leo/mongo/mongodb-linux-x86_64-rhel62-3.4.4/log/mongod.log
processManagement:
    fork: true
net:
    port: 27018
storage:
    dbPath: /leo/mongo/data/mongod
[leo@test1 bin]$ ./mongod --config ./mongod.cfg
about to fork child process, waiting until server is ready for connections.
forked process: 2881
child process started successfully, parent exiting
```
* 把 test2 上的mongod 也起来
* 把 test3 上的arbit 起起来
```
[leo@test3 bin]$ cat arbit.cfg
sharding:
    clusterRole: shardsvr
replication:
    replSetName: rs0
systemLog:
    destination: file
    path: /leo/mongo/mongodb-linux-x86_64-rhel62-3.4.4/log/arbit.log
processManagement:
    fork: true
net:
    port: 27020
storage:
    dbPath: /leo/mongo/data/arbit
[leo@test3 bin]$ ./mongod --config ./arbit.cfg
about to fork child process, waiting until server is ready for connections.
forked process: 3719
child process started successfully, parent exiting
```
* 配置
```
> rs.initiate()
{
        "info2" : "no configuration specified. Using a default configuration for the set",
        "me" : "test1:27018",
        "ok" : 1
}
rs0:OTHER> rs.add("test2:27018")
{ "ok" : 1 }
rs0:PRIMARY> rs.addArb("test3:27020")
{ "ok" : 1 }
```
* 用同样的方法配置rs1 集群
##部署configdb集群
* 在test1 test2 test3 上启动mongo arbit 进程
```
[leo@test1 bin]$ cat ./configdb.cfg
sharding:
    clusterRole: configsvr
replication:
    replSetName: configdb
systemLog:
    destination: file
    path: /leo/mongo/mongodb-linux-x86_64-rhel62-3.4.4/log/configdb.log
processManagement:
    fork: true
net:
    port: 27019
storage:
    dbPath: /leo/mongo/data/configdb
[leo@test1 bin]$ ./mongod --config ./configdb.cfg
about to fork child process, waiting until server is ready for connections.
forked process: 3236
child process started successfully, parent exiting
```
* 配置
```
> rs.initiate()
{
        "info2" : "no configuration specified. Using a default configuration for the set",
        "me" : "test1:27019",
        "ok" : 1
}
configdb:OTHER> rs.add("test2:27019")
{ "ok" : 1 }
configdb:PRIMARY> rs.add("test3:27019")
{ "ok" : 1 }
```
##部署mongos
* 启动mongos
```
[leo@test4 bin]$ cat mongos.cfg
sharding:
    configDB: configdb/test1:27019,test2:27019,test3:27019
systemLog:
    destination: file
    path: /leo/mongo/mongodb-linux-x86_64-rhel62-3.4.4/log/mongos.log
processManagement:
    fork: true
net:
    port: 27017
[leo@test4 bin]$ ./mongos --config ./mongos.cfg
about to fork child process, waiting until server is ready for connections.
forked process: 2923
child process started successfully, parent exiting
```
* 配置
```
mongos> sh.addShard('rs0/test1:27018,test2:27018')
{ "shardAdded" : "rs0", "ok" : 1 }
mongos> sh.addShard('rs1/test3:27018,test4:27018')
{ "shardAdded" : "rs1", "ok" : 1 }
```
***
#配置需要分片的库，表
```
mongos> sh.enableSharding('database_name')
{ "ok" : 1 }
mongos> sh.shardCollection('database_name.collection_name',{'_id':1}) // 根据某个键分片（该键必须有索引）
{ "collectionsharded" : "database_name.collection_name", "ok" : 1 }
```

乱读天书， 不求甚解

乱读天书，不求甚解